[INVOICEDEBITS:-100] - invoice sum of all debit items with offset
[INVOICEDEBITSNUM] - As per [INVOICEDEBITS] but the value is displayed with a decimal point and no thousands separator (for calculations) (for calculationcalculations)
[INVOICEDEBITSNUM:] - As per [INVOICEDEBITS:] but the value is displayed with a decimal point and no thousands separator (for calculations).
[INVOICEVAT] - invoice sum of all vat value
[INVOICEVATNUM] - invoice sum of all vat value for calculations)
[INVOICEFIRSTITEM] - price of the item listed first in the invoice